System update - now won’t switch on

[Sophie Wilson1]

Microsoft surface laptop 4. Bought in March this year. Has worked fine: it did a system update and now won’t turn on it just shows the windows logo, makes a sound and then says restarting and just does that on a loop. The fn light works. I can get the advanced options page up but I don’t know my recovery key to be able to reset. How can system updates cause this? It is such a new laptop, all my work is on there and I can‘t work without it. I thought Microsoft was meant to be reliable!!

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